The anomalous magnetic moment of the muon in the D-brane realization of the Standard Model
E. Kiritsis, P. Anastasopoulos
TL;DR
The paper addresses the muon g-2 discrepancy by embedding the Standard Model in a D-brane orientifold framework with a low string scale and two anomalous $U(1)$ gauge bosons. It performs a one-loop calculation including axionic partners, showing that the heavy anomalous $U(1)$ states can produce a correction $\delta \alpha_{\mu}$ of the right order to reconcile the data, with a clean dependence on the massive boson masses $\mu_i$ and rotated charges $Q_{iL}, Q_{iR}$. The analysis indicates that TeV-scale anomalous gauge bosons can account for the experimental signal, while suggesting that explicit orientifold vacua are needed for precise, model-specific predictions. The work connects string-scale physics to precision SM observables and highlights the potential for near-future collider- or precision experiments to probe such new gauge sectors, pending a full string-theoretic embedding. $\delta \alpha_{\mu}$ is found to be consistent with $(4.3\pm1.6)\times10^{-9}$ within the proposed parameter space.
Abstract
The anomalous magnetic moment of the muon is evaluated in the D-brane realization of the Standard Model. It is pointed out that the massive anomalous U(1) gauge bosons predicted, give extra contributions that are compatible with current experimental data.